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to Inspection
Criteria and Sling Properties Main Page |
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| Basic
Factors concerning the use of Synthetic Slings |
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| 1. |
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RATED CAPACITY (Rated Load;
WLL) of a sling is based upon the Nominal Breaking Strength of the material
used in the sling, AND FACTORS which affect the overall strength of a sling.
These factors include ATTACHMENT or FABRICATION EFFICIENCY, the number of
plys in a web sling, type of hitch (see below), LOAD SHAPE AROUND WHICH
THE BODY OF THE SLING IS POSITIONED, and the shape of the hardware which
the sling is rigged with to the crane or lifting device. |
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| 2. |
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RATED CAPACITY of a sling is
different for each of the three basic methods of rigging (see below). These
rated capacities are listed in this catalogue. The RATED CAPACITIES apply
to slings made by UNIROPE ONLY and are indicated on capacity tags. |
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| 3. |
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NEVER "SHOCK LOAD" a sling.
There is no practical way to estimate the actual force applied by shock
loading. The rated capacity of a sling can easily be exceeded by a sudden
application of force, and damage can occur to the sling. The sudden release
of a load can also damage a sling. |
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| 4. |
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The BODY of a sling MUST be
protected with corner protectors, blocking or padding against damage by
sharp edges or corners of a load being lifted. Sharp bends that distort
or cut the sling body will result in sling failure. |
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| 5. |
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ANY ANGLE other than vertical
at which the sling is rigged, increases the loading (tension) on the sling. |
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| 6. |
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A sling should be given a VISUAL
INSPECTION BEFORE EACH LIFT OR USAGE to determine if it is capable of
safely making the intended lift. |
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| 7. |
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An inspection should include such things
as:
• Acid or Caustic Burns
• Melting or charring of any part of the sling
• Holes, tears, cuts, or snags
• Broken or worn stitching in load bearing splices
• Abrasive Wear
• Knots in any part of the sling
• Damage to end fittings
• Other visible damage that causes doubt as to the strength of the
sling |
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| 8. |
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Whenever a sling is found to be deficient,
the eyes must be cut, or other end attachments or fittings removed to prevent
further use, and the sling body discarded. |
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| 9. |
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Synthetic Slings should be stored in
a cool, dry, and dark place. Slings should also be kept free of dirt and
foreign material. Mild soap and water can be used to clean slings. |
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| Every Lift
uses 1 of 3 Basic Hitches |
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VERTICAL, or straight,
attachment is simply using a sling to connect a lifting hook or other
device to a load. Full rated load of the sling may be used, but never
exceeded. A tagline should be used on such a lift to prevent rotation
which can damage the sling.
CHOKER hitches reduce lifting capacity of a sling, since this
method of rigging affects the ability of the sling to adjust during
the lift, places angular loading on the body of the sling, and creates
a small diameter bend in the sling at the choke point.
BASKET hitches distribute the load equally between the two
legs of a sling, within limitations imposed by the angles at which
legs are rigged to the load. |
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